VSC8117QP2 VITESSE [Vitesse Semiconductor Corporation], VSC8117QP2 Datasheet - Page 21

• Manufacturer Part Number: VSC8117QP2
• Description: ATM/SONET/SDH 622/155 Mb/s Transceiver Mux/Demux with Integrated Clock Generation and Clock Recovery
• Manufacturer: VITESSE [Vitesse Semiconductor Corporation]

VSC8117
G52221-0, Rev. 4.1
1/8/00
Data Sheet
Ground Planes
tioned in an attempt to provide isolation to various components. Sectioning of the ground planes tends to inter-
fere with the ground return currents on the signal lines. In addition, the smaller the ground planes the less
effective they are in reducing ground bounce noise and the more difficult to decouple. Sectioning of the positive
supplies can provide some isolation benefits.
Table 17: AC Coupling Component Values
The ground plane for the components used in the High Speed interface should be continuous and not sec-
DRIVER
(Optics Module)
C1, C2, C3, C4
GND
Component
R1
R1
R2
R3
R4
PC Board Trace
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: [phone]
VITESSE
Figure 12: AC Coupled High Speed I/O
VITESSE SEMICONDUCTOR CORPORATION
SEMICONDUCTOR CORPORATION
C1
Note: Only one side of a differential signal is shown.
+3.3V
GND
ATM/SONET/SDH 622/155 Mb/s Transceiver Mux/Demux
with Integrated Clock Generation and Clock Recovery
VSC8117
PECL I/O
.01uf High Frequency
270 ohms
190 ohms
75 ohms
68 ohms
Value
GND
R2
PC Board Trace
C2
+5.0V
GND
R3
R4
Tolerance
RECEIVER
(Optics Module)
5%
5%
1%
1%
Page 21